MS-0387

A 28-year-old, gravida 2 para 1, presents to the emergency department with pelvic pain. She delivered a healthy baby at 37 weeks gestation 13 days ago.

During the examination, it was found that she has right lower quadrant pain and her temperature is 37.8º C. Further tests revealed a left gonadal (ovarian) vein thrombosis. The patient was informed about the risk of the thrombus lodging in the venous system from the left gonadal vein.

What is the first structure that the thrombus will go through if lodged from the left gonadal vein?